try:
    a = int(input("请输入整数:"))
    b = int(input("请输入整数:"))
    op1 = input("请输入 +-*/ ")
    if op1 == "+":
        print(a + b)
    elif op1 == "-":
        print(a - b)
    elif op1 == "*":
        print(a * b)
    elif op1 == "/":
        print(a / b)
    else:
        print("op1不对")
except ValueError:
    print("请输入一个可以转化整数")
except ZeroDivisionError:
    print("请输入一个可以转化整数")
except:
    print("未知错误")
